LOL A number of dimensions were based on Henry. The inch was standardised to 25.4mm a long time ago now.
A metric thread drill size for tapping is dia - pitch. For imperial I uses Zeus tables that has other things in it as well. The range of pitch sizes the metric system did use in the past was crazy but ISO rationalised them not all that many years ago. The imperial pitch system was based on teeth per inch. The numbers used do have advantages when screw cutting them on a lath via gears especially with a screw cutting gearbox.
We have dual pitch lathes, tpi or mm pitch.
There is an extra gear for converting in some lathes, and some have that function built in.
In any case, we have gone astray as usual, and I wait for OP to respond.
There is an extra gear for converting in some lathes, and some have that function built in.
In any case, we have gone astray as usual, and I wait for OP to respond.
That needle table is more or less BS wire gauge, check it out, AWG diameters are different.
0.7 and 0.71 mm for 22G, for example.
0.7 and 0.71 mm for 22G, for example.
So did you know that the size of TPA3118 chip is in the ballpark of 1nac (nano acre)?
Depends... is that a nano Etruscan or a micro Macedonian acre?
Philosophically, the measurement system of a culture reflect its world view. They didn't need meters/second when the most they'd do was 20 miles a day with a mule and a cart -on a Roman road. They didn't need clocks either because they didn't work in factories where wages were paid per time and shifts allowed long day production.
I believe their measure of distance were cubits and digits. I've never looked into their area... but I doubt they used area as the square of distance.
Philosophically, the measurement system of a culture reflect its world view. They didn't need meters/second when the most they'd do was 20 miles a day with a mule and a cart -on a Roman road. They didn't need clocks either because they didn't work in factories where wages were paid per time and shifts allowed long day production.
I believe their measure of distance were cubits and digits. I've never looked into their area... but I doubt they used area as the square of distance.
203.210186752552446... feet per side... an irrational number.... yikes...
The British were irrational alright...
The British were irrational alright...
An acre is 4840 square yards (10 chains by 1 chain, where a chain is 22 yards, the length of a cricket pitch (pitch, not field, note))
So thats 9 x 4840 = 43560 square feet exactly.
Excruciating details here: https://en.wikipedia.org/wiki/Acre
So thats 9 x 4840 = 43560 square feet exactly.
Excruciating details here: https://en.wikipedia.org/wiki/Acre
Reminds me of the guy who's last name was Acre.
He invited his family to his birtday party and then boasted he had 26 Acres under one roof ;-)
Jan
He invited his family to his birtday party and then boasted he had 26 Acres under one roof ;-)
Jan